In 2009, published genome-wide DNA data was not available for a single ancient human individual. Today, there is genome-wide data available for more than 6,000 ancient humans. This rapid expansion of ancient DNA (aDNA) research enables scientists to uncover more information than ever on past human populations, including their genetic adaptations, patterns of migration and mixing, and even clues about our species’ deep past. But this wide availability of aDNA brings ethical questions on how the data is gathered and used to the forefront.